9.5 - Physical properties of organic compounds

Front

What is the boiling point of a substance?

Back

The temperature at which a liquid's vapor pressure equals the external pressure surrounding the liquid, causing it to change into vapor.

Front

What factors influence the boiling point of organic compounds?

Back

Molecular weight, intermolecular forces (such as hydrogen bonding, dipole-dipole interactions, and dispersion forces), and molecular structure.

Front

What are dipole-dipole interactions?

Back

Attractive forces between polar molecules, where the positive end of one molecule is attracted to the negative end of another.

Front

What is hydrogen bonding?

Back

A strong type of dipole-dipole interaction that occurs between molecules containing hydrogen bonded to highly electronegative atoms like oxygen, nitrogen, or fluorine.

Front

What are dispersion forces?

Back

Weak intermolecular forces arising from temporary dipoles that occur when electron distribution within molecules is uneven.

Front

Why does butanal have a higher boiling point than butane?

Back

Due to dipole-dipole interactions between carbonyl groups in butanal.

Front

Why does butanoic acid have a higher boiling point than butanal?

Back

Because butanoic acid can form hydrogen bonds between its molecules.

Front

Which compound has the highest boiling point: butan-1-ol, butanal, butane, or butanoic acid?

Back

Butanoic acid has the highest boiling point due to its ability to form hydrogen bonds.

Front

What is the relationship between molecular mass and boiling point?

Back

Generally, as molecular mass increases, boiling point increases due to higher dispersion forces.

Front

Why does butane have a higher boiling point than methane?

Back

Butane has higher dispersion forces to overcome due to having more electrons.